SANTA CLARA — The gates opened, the 49ers finally kicked off the Levi’s Stadium era, and after that they would prefer you forget everything else that happened Sunday.

They won’t forget, delete or ignore any of their 34-0 loss to Denver, though.

This was a minor embarrassment for a team with major goals, and Jim Harbaugh is a coach with a long and detailed memory.

So the 49ers won’t expunge their miserable first two exhibition games, which have ended up in a combined 57-3 score, with the 49ers on the very, very wrong side of that.

What’s a predicted Super Bowl contender supposed to do after two August stinkers?

Here’s what: Admit that everything’s a little shaky right now, get most of their headliners healthy and back into the lineup, and weed out the clunkiest parts of the operation.

Then: Plow into the Sept. 7 regular-season opener at Dallas at full steam.

Naturally, none of that is impossible for a team this talented and this accomplished.

But it did look a little less certain after the 49ers’ performance Sunday before 68,500 bemused fans.

“It’s off,” Harbaugh said of his team’s play. “It’s off right now. Definitely off in little correctable ways.

“That’s what I see. Feel like we can get it corrected.”

Harbaugh didn’t seem infuriated by his team’s wobbly play so far; mainly, he just seemed ready to race into the film room to figure out exactly which players were screwing up the most.

Those guys might not be on the 49ers roster for much longer.

This, of course, comes after the 49ers’ 23-3 exhibition-opening loss in Baltimore and amid general concerns about their backup quarterback spot behind starter Colin Kaepernick and injuries dotting the defensive unit.

They did nothing to dispel any of the worries Sunday, and actually things probably got a little worse on all fronts.

First problem: Presumed backup QB Blaine Gabbert was scattered once again and threw another interception, and No. 3 QB Josh Johnson lost a fumble.

Harbaugh said the team won’t be searching for another QB at this time, and he didn’t have to add that Gabbert carries a $2 million guaranteed contract.

But Harbaugh made it clear that nobody has won the backup job yet and that he isn’t thrilled by this development.

“Whoever doesn’t turn the ball over will be the backup quarterback,” Harbaugh said.

Possible outcome: As they did last season when Colt McCoy was the shaky backup, the 49ers could go into the regular season knowing that they cannot survive any serious injury to Kaepernick.

Which is a nervous place to be.

Second problem: The 49ers defense was torched by Peyton Manning and backup Brock Osweiler, too, and the Broncos ended up outgaining the 49ers 357-230.